Drawing in unity UI canvas

Question

Hi , I am trying to do drawing in Unity UI canvas,Is there anything like plugin that can support this thing.?

Answer 1

Answer by Juliken · Nov 02, 2018 at 03:04 PM

I dont know a plugin but you can try to code it yourself using sprites or images.

When the button of the mouse is down, you can instantiate images on canvas depending on your cursor position. You can increase image size to get a "bigger brush".

I think the biggest problem is the optimization but I dont know.

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Answer 2

Answer by gdegeneve · Nov 02, 2018 at 03:24 PM

I would try to do it in the following way:

Create a second camera and assign it a RenderTexture.

Set the clear mode of the camera to none, so it always draws over the previous render.

Set the render layer of the new camera to a new Layer you call "brush".

Then create some mesh or quad and assign it to the brush layer.

Now position the new camera in a way, that it can see your brush object.

Move the brush object by assigning it the position of your mouse.

The render texture should now contain all of the brushs movements in realtime

Assign the render texture to an image on your canvas.

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Drawing in unity UI canvas

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